Which size (M or L) I should by if I my...
Which size (M or L) I should by if I my head circumference is about 59 cm?
My head measures about 60cm and my Giro Phase in L fits very well. I can wear a liner in the winter and I can tighten it to where I can't really even get it on, so I think it would be ok for you. My experience is that when you're at the top of the fit range for a size, I usually feel restricted.